Study of Beta Lyrae CCD spectra - Absorption lines, orbital elements, and disk structure of the gainer

Details Study of Beta Lyrae CCD spectra - Absorption lines, orbital elements, and disk structure of the gainer Study of Beta Lyrae CCD spectra - Absorption lines, orbital elements, and disk structure of the gainer

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18..287s&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 287; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 8, p. 711-726. In R

Astronomy and Astrophysics

Astronomy

12

Absorption Spectra, Binary Stars, Charge Coupled Devices, Orbital Elements, Stellar Orbits, Stellar Spectra, Radial Velocity, Spectrum Analysis

Scientific paper

High-resolution red spectra of Beta Lyr were obtained with the CCD camera at the 2.6-m Shain telescope of the Crimean Observatory. Results of radial velocity measurements of the ionized silicon doublet are listed for all four components of its profiles. The features of radial velocity curves are considered, and orbital elements of the bright and faint components are determined from radial velocity curves. The obtained mass ratio of q = M2/M1 = 4.6 +/- 0.1 can essentially be considered final. Assuming an 80-deg declination of the orbit, the mass of the bright loser component should be about 2.9 solar masses, and that of the secondary gainer component about 13.2 solar masses. The satellite lines phenomenon, which can be observed in Beta Lyr spectra before and after the main eclipse center, is also studied. The radial velocity curves of satellite lines belonging to different chemical elements are asymmetric relative to the eclipse median. The appearance of these lines in the Beta Lyr spectrum is explained by the hypothesis of a gas disk around the gainer, which in phases before and after the eclipse is projected onto the bright component alternately by the sides moving in opposite directions.

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